South Tacoma Way is pretty awful, then, again parts of Seattle is also pretty awful…
University Place is good. I have some family members that live there. I would say if you are west University Place its a nice area, not, Bellevue nice, but nice enough.
My daughters' club soccer teams in the 00's and 10's had numerous University Place area players on them, nice area, good kids, nice families, high achievers. (Club was formerly FC Royals, then renamed FC United and merged with boys club) One daughter's team won the WA state Premier-1 club championship during her U16 year, other daughter's team made final but didn't win, also the U16 year. I remember one family from Fircrest, and their line was "Fircrest is Mayberry" (as in Mayberry RFD, the old TV show with Andy Griffith, IIRC). From what I saw at the time, that was pretty much true.
Sometimes I bus it from SeaTac to the South Tacoma Park-n-Ride, and then from there to Olympia when I'm coming back from Florida for a visit to WA. While not exactly high-end, I haven't had any problems at the 512 Park-n-ride on South Tacoma Way, and have had some enjoyable conversations on the bus. Not like living near there, of course. Lately though, I usually rent a car at SeaTac for a couple days, cheaper than an Uber ride from the airport to Olympia.